2019-11-30
2131
#css
Craig Buckler
10539
Nov 30, 2019 ⋅ 7 min read

Jank-free page loading with media aspect ratios

Craig Buckler Freelance UK IT consultant specializing in HTML5 webby stuff.

Recent posts:

Developing Web Extensions With Wxt

Developing web extensions with the WXT library

Browser extensions are an important part of the web ecosystem. They make our lives easier and enhance our web browsing […]

Debjyoti Banerjee
May 24, 2024 ⋅ 8 min read
Bulma Css Adoption Guide: Overview, Examples, And Alternatives

Bulma CSS adoption guide: Overview, examples, and alternatives

Explore how Bulma CSS simplifies frontend development with its ease of use and customizable, responsive, pre-designed UI elements.

Timonwa Akintokun
May 23, 2024 ⋅ 10 min read
Using Mountaineer To Develop A React App With Python

Using Mountaineer to develop a React app with Python

Develop a React app with Python using the Mountaineer framework for building a simple app with integrated your frontend and backend database.

Rosario De Chiara
May 23, 2024 ⋅ 7 min read
Enhance CSS View Transitions With Velevette

Enhance CSS view transitions with Velvette

Velvette is a utility library developed to make working with view transitions easier.

David Omotayo
May 22, 2024 ⋅ 9 min read
View all posts

3 Replies to "Jank-free page loading with media aspect ratios"

  1. This is great but I am struggling here a bit. For example. On my photo hosting site, I display a random selection of images. These are shown as thumbnails. See here:

    https://www.ag2si.com/gallerysoft/

    What I am having difficulty with understanding is the following:
    I created the site as responsive, so when you grow or shrink the browser, the thumbnails grow and shrink as well.
    I know the aspect ratio of the original image.
    I use flex and specify something like so
    flex:${aspect};
    However, since the page is dynamic in size, I do not know what size the thumbnails will be. Therefore, I cannot add the width and height attributes to the src tag. And a pagespeed web dev site recommends I should include them.

    Does that make sense?

    Thanks
    JT

  2. You set the width and height of the original image – not the dimensions it’ll be displayed at.

    So a 600×450 image has width=”600″ height=”450″ regardless of how it appears on the page. The browser will calculate it’s aspect ratio so, if the resulting image width is 300px, it’ll reserve 225px of vertical space before the image has started to load.

    Therefore, width=”4″ height=”3″ and width=”8000″ height=”6000″ would act identically – they’re all the same aspect ratio.

Leave a Reply